package java061;
import java.util.*;

public class Main061 {

	public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
		int[] arr=new int[5];
		String str=null;
		while(true){
			String choice=sc.next();
		try{
			if(choice.equals("arr")){
				int index=sc.nextInt();
				arr[index]=1;
			}
			else if(choice.equals("null")){
				str.length();
			}
			else if(choice.equals("cast")){
				Object o=new String("str");
				Integer x=(Integer)o;
			}
			else if(choice.equals("num")){
				String intnum=sc.next();
				Integer.parseInt(intnum);
			}
			else{
				break;
			}
		}catch(Exception e){
			System.out.println(e);
		}
		
		}
		
	}

}
